Separate Scope into DeclarationScope and Scope

src/full-codegen/x64/full-codegen-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 73 matching lines @@
 //   o rdi: the JS function object being called (i.e. ourselves)
 //   o rdx: the new target value
 //   o rsi: our context
 //   o rbp: our caller's frame pointer
 //   o rsp: stack pointer (pointing to return address)
 //
 // The function builds a JS frame.  Please see JavaScriptFrameConstants in
 // frames-x64.h for its layout.
 void FullCodeGenerator::Generate() {
   CompilationInfo* info = info_;
+  DCHECK_EQ(scope(), info->scope());
   profiling_counter_ = isolate()->factory()->NewCell(
       Handle<Smi>(Smi::FromInt(FLAG_interrupt_budget), isolate()));
   SetFunctionPosition(literal());
   Comment cmnt(masm_, "[ function compiled by full code generator");
 
   ProfileEntryHookStub::MaybeCallEntryHook(masm_);
 
   if (FLAG_debug_code && info->ExpectsJSReceiverAsReceiver()) {
     StackArgumentsAccessor args(rsp, info->scope()->num_parameters());
     __ movp(rcx, args.GetReceiverOperand());
@@ skipping 82 matching lines @@
     function_in_register = false;
     // Context is returned in rax.  It replaces the context passed to us.
     // It's saved in the stack and kept live in rsi.
     __ movp(rsi, rax);
     __ movp(Operand(rbp, StandardFrameConstants::kContextOffset), rax);
 
     // Copy any necessary parameters into the context.
     int num_parameters = info->scope()->num_parameters();
     int first_parameter = info->scope()->has_this_declaration() ? -1 : 0;
     for (int i = first_parameter; i < num_parameters; i++) {
-      Variable* var = (i == -1) ? scope()->receiver() : scope()->parameter(i);
+      Variable* var =
+          (i == -1) ? info->scope()->receiver() : info->scope()->parameter(i);
       if (var->IsContextSlot()) {
         int parameter_offset = StandardFrameConstants::kCallerSPOffset +
             (num_parameters - 1 - i) * kPointerSize;
         // Load parameter from stack.
         __ movp(rax, Operand(rbp, parameter_offset));
         // Store it in the context.
         int context_offset = Context::SlotOffset(var->index());
         __ movp(Operand(rsi, context_offset), rax);
         // Update the write barrier.  This clobbers rax and rbx.
         if (need_write_barrier) {
@@ skipping 10 matching lines @@
   }
 
   // Register holding this function and new target are both trashed in case we
   // bailout here. But since that can happen only when new target is not used
   // and we allocate a context, the value of |function_in_register| is correct.
   PrepareForBailoutForId(BailoutId::FunctionContext(),
                          BailoutState::NO_REGISTERS);
 
   // Possibly set up a local binding to the this function which is used in
   // derived constructors with super calls.
-  Variable* this_function_var = scope()->this_function_var();
+  Variable* this_function_var = info->scope()->this_function_var();
   if (this_function_var != nullptr) {
     Comment cmnt(masm_, "[ This function");
     if (!function_in_register) {
       __ movp(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
       // The write barrier clobbers register again, keep it marked as such.
     }
     SetVar(this_function_var, rdi, rbx, rcx);
   }
 
   // Possibly set up a local binding to the new target value.
-  Variable* new_target_var = scope()->new_target_var();
+  Variable* new_target_var = info->scope()->new_target_var();
   if (new_target_var != nullptr) {
     Comment cmnt(masm_, "[ new.target");
     SetVar(new_target_var, rdx, rbx, rcx);
   }
 
   // Possibly allocate RestParameters
   int rest_index;
-  Variable* rest_param = scope()->rest_parameter(&rest_index);
+  Variable* rest_param = info->scope()->rest_parameter(&rest_index);
   if (rest_param) {
     Comment cmnt(masm_, "[ Allocate rest parameter array");
     if (!function_in_register) {
       __ movp(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
     }
     FastNewRestParameterStub stub(isolate());
     __ CallStub(&stub);
     function_in_register = false;
     SetVar(rest_param, rax, rbx, rdx);
   }
 
   // Possibly allocate an arguments object.
-  Variable* arguments = scope()->arguments();
+  DCHECK_EQ(scope(), info->scope());
+  Variable* arguments = info->scope()->arguments();
   if (arguments != NULL) {
     // Arguments object must be allocated after the context object, in
     // case the "arguments" or ".arguments" variables are in the context.
     Comment cmnt(masm_, "[ Allocate arguments object");
     if (!function_in_register) {
       __ movp(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
     }
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
@@ skipping 11 matching lines @@
   if (FLAG_trace) {
     __ CallRuntime(Runtime::kTraceEnter);
   }
 
   // Visit the declarations and body unless there is an illegal
   // redeclaration.
   PrepareForBailoutForId(BailoutId::FunctionEntry(),
                          BailoutState::NO_REGISTERS);
   {
     Comment cmnt(masm_, "[ Declarations");
-    VisitDeclarations(scope()->declarations());
+    VisitDeclarations(info->scope()->declarations());
   }
 
   // Assert that the declarations do not use ICs. Otherwise the debugger
   // won't be able to redirect a PC at an IC to the correct IC in newly
   // recompiled code.
   DCHECK_EQ(0, ic_total_count_);
 
   {
     Comment cmnt(masm_, "[ Stack check");
     PrepareForBailoutForId(BailoutId::Declarations(),
@@ skipping 3203 matching lines @@
   __ movp(Operand(rbp, frame_offset), value);
 }
 
 
 void FullCodeGenerator::LoadContextField(Register dst, int context_index) {
   __ movp(dst, ContextOperand(rsi, context_index));
 }
 
 
 void FullCodeGenerator::PushFunctionArgumentForContextAllocation() {
-  Scope* closure_scope = scope()->ClosureScope();
+  DeclarationScope* closure_scope = scope()->GetClosureScope();
   if (closure_scope->is_script_scope() ||
       closure_scope->is_module_scope()) {
     // Contexts nested in the native context have a canonical empty function
     // as their closure, not the anonymous closure containing the global
     // code.
     __ movp(rax, NativeContextOperand());
     PushOperand(ContextOperand(rax, Context::CLOSURE_INDEX));
   } else if (closure_scope->is_eval_scope()) {
     // Contexts created by a call to eval have the same closure as the
     // context calling eval, not the anonymous closure containing the eval
@@ skipping 137 matching lines @@
   DCHECK_EQ(
       isolate->builtins()->OnStackReplacement()->entry(),
       Assembler::target_address_at(call_target_address, unoptimized_code));
   return ON_STACK_REPLACEMENT;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64